Ermolova appeared in international tournaments in 2014, she competed as HC at the Minsk Junior World Cup and at the Russian Youth championships.

In 2015, Ermolova started her season at the 2015 Moscow Grand Prix winning the all-around gold.

In October 2–4, Ermolova together with senior teammates Margarita Mamun and Aleksandra Soldatova represented Team Gazprom at the 2015 Aeon Cup in Tokyo Japan, Ermolova won the junior individual all-around title (Rope:16.733, Hoop:16.716, Ball:16.683, Clubs:16.766) with a total of 66.898 and with Team Russia winning the gold medal in the overall standings.

She then won the all-around gold at Happy Caravan Junior World Cup in Tashkent.

[2] Ermolova suffered an ankle injury in 2017 and underwent operation in Germany, she required to be on crutches for a few months.